Scale Models

Before committing a single meter of full-scale track, Arista built a series of careful scale models, one five-hundredth the size of the real thing, small enough to fit across her workshop table, but built with the same precision she'd give the real structure.

"...Piece by piece first," she explained to Claire, laying out the first miniature section. "Drop, into the corkscrew, nothing beyond that yet. I want to isolate exactly how much momentum survives each individual segment before I start stacking them together and losing track of where things actually change."

The first model, drop and corkscrew alone, sent a small test cart rocketing down the miniature slope and cleanly through the spiral, emerging with speed still comfortably above the minimum threshold Marek's calculations required.

"...Good," Arista said, tracking the exit velocity with a small, hand-cranked measuring wheel pressed against the track. "Corkscrew's not bleeding more speed than expected."

The second model added a loop in place of the corkscrew, testing the inversion's demands on momentum specifically: loops, she already knew from research, cost considerably more speed than a simple corkscrew, the centripetal force required to keep a cart on track through the inversion's peak eating directly into whatever momentum remained.

"...There's the difference," she murmured, watching the cart clear the loop with noticeably less speed left over than the corkscrew test had shown. "Loops are expensive. Corkscrews are comparatively cheap. Good to actually confirm that at scale instead of just trusting the math on paper."

Nettle wandered in partway through, drawn by curiosity, and leaned over the miniature loop section with obvious delight. "...Can I try one?"

"Sure, just release it the same way I—"

Nettle had already given the small test cart an enthusiastic push before Arista finished the sentence, considerably more force behind it than a simple drop would have provided. The cart rocketed through the loop, carrying visibly excess speed into the following curve, and promptly lifted clean off the miniature track, sailing a short, dramatic arc through the air before landing in a heap several inches beyond the table's edge.

Silence.

"...That was informative too, actually," Arista said, retrieving the cart. "Confirms the banking tolerance has some margin for error, at least. Just, maybe don't push the next one quite so enthusiastically."

"No promises," Nettle said, entirely unrepentant, already eyeing the next model with clear intent.

The third model tested the tunnel section in isolation, flat, enclosed, no elevation change, purely measuring whatever friction and air resistance the enclosed passage introduced compared to open track.

"...Minimal loss," Claire reported, checking the results against the open-air baseline. "Tunnel's not meaningfully more resistant than exposed track. Good, that simplifies the overall momentum budget considerably."

Only once she'd isolated every individual segment's cost did Arista finally assemble the full-scale model, the entire route in miniature, drop, corkscrew, loop, tunnel, second corkscrew, climb, all connected in the exact sequence the real structure would follow.

She released the test cart from the model's starting point and watched, notebook in hand, tracking its speed at every major junction as it worked through the complete sequence.

"...There," she said, marking the exact point along the model's final climb where the cart's momentum finally, visibly ran out, not stopping abruptly, but slowing steadily, gradually, the moment where gravity alone could no longer carry it any further upward.

She marked the spot carefully, then added a generous margin beyond it, considerably further down the slope than the cart had actually needed, deliberately erring toward more cable coverage than the bare minimum.

"...Why the extra margin?" Bram asked, watching her extend the marked zone well past the model's actual momentum-loss point.

"Because this is a scale model, not the real thing," Arista said. "Air resistance, friction, exact rider weight, minor manufacturing tolerances at full size, none of that scales down perfectly clean. I'd rather have the cable's catch point start a little early, engaging the cart while it's still got some residual momentum, than cut it too close and risk the cart stalling out on the slope with nobody able to reach it."

Claire nodded, satisfied with the caution. "Better an inefficient catch point than a stranded cart on a ninety-meter incline."

"Exactly." Arista measured the final distance carefully, translating the scaled margin back up to full size. "That gives me the cable's actual starting point, and from there, the total length needed to reach all the way to the top of the climb." She did the math, checking it twice. "Cable needs to run considerably shorter than the tunnel loop did, thankfully, this isn't twenty kilometers, just the length of the final climb, with the safety margin built in."

Unauthorized tale usage: if you spot this story on Amazon, report the violation.

Bram studied the completed model, the whole miniature route laid out cleanly across the table, every segment tested and measured individually before ever being trusted together.

"...You tested this properly," he said, something like genuine approval in his voice. "Piece by piece, before ever risking the full assembly."

"Same discipline as everything else," Arista said, satisfied, already sketching the final cable length into her master blueprint. "I don't build the whole thing and hope. I test the parts, understand exactly where they fail, and build in enough margin that failure never actually becomes a real possibility."

She set the finished models aside, the full-scale design finally, properly complete.

Gorthruk arrived partway through the final assembly test, drawn by curiosity more than any specific need to be there, and lingered afterward, studying the completed scale model with unexpected, genuine interest.

"...This is nice craftsmanship," he said, turning the miniature structure over carefully in his thick hands, examining the joinery at each connection point.

Arista glanced up, mildly surprised by the specific attention he was giving it. "...Thank you. Wasn't expecting a compliment on the support framework, specifically. Wood's just for the structure holding everything in place, the actual track surface is still a properly scaled metal strip, same friction properties as the real thing. Wouldn't get accurate momentum readings otherwise."

"Small, precise work has its own merit," Gorthruk said, setting the model back down with evident care. "Not every worthwhile craft requires a full furnace running behind it."

With the scale models tested and the design finally locked in, Arista turned her attention to the material side of the actual build.

"...We're not building the whole track out of adamantium," Arista started, laying out the full materials plan for the assembled crew.

"I am here," Marek announced, arriving a beat late, entirely unbothered by the fact.

Arista glanced up. "...I thought you'd be here half an hour ago."

"I was meeting a friend."

"A friend?" She perked up, insanely curious. "Who?"

"Focus on the project, Pinky."

Arista huffed, letting it go for now, and picked the materials plan back up where she'd left off. "Anyway. That would be wildly excessive, and honestly, unnecessary. Steel handles the vast majority of this project perfectly well."

Bram raised an eyebrow. "You? Choosing to not over-engineer something?"

"I'm choosing to engineer it correctly," Arista corrected, grinning. "Adamantium's incredible, but it's also expensive, genuinely slow to produce at the volume this project would need, and overkill for sections that just need to hold a cart's weight along a stable, well-supported path. Steel's more than strong enough for that, and it's what the dwarven smiths and Nettle's guild can produce fast, at the actual scale this project needs."

Gorthruk, reviewing the materials breakdown, nodded slowly in approval. "A sensible allocation. Adamantium reserves are not infinite, even with the furnace network running steadily. Reserving it for where it genuinely matters shows restraint I don't often see from you."

"I've learned restraint," Arista said, mock-wounded. "Occasionally."

"So where does the adamantium actually go?" Claire asked, studying the blueprint for the load-bearing points already marked in a different color from the rest.

"Support beams, primarily," Arista said, tracing the marked sections. "Every major vertical structure holding the track's weight against gravity, the tower supporting the initial drop, the corkscrew's central spine, both climb sections' primary framework. Anywhere the entire structure's integrity depends on one specific point not failing under sustained, repeated stress."

"And the track itself?" Bram asked.

"Steel, almost entirely. The actual rail the cart rides along experiences plenty of stress too, obviously, but it's distributed stress: spread across the cart's wheels, the rail's own continuous length, absorbed gradually rather than concentrated at a single critical point. Steel handles that kind of distributed load beautifully, same as it's handled every previous track and rail I've ever built."

Marek, cross-referencing the stress calculations against the materials plan, spoke up. "The loop and corkscrew sections specifically, those experience the highest concentrated forces, given the centripetal load at the inversion points. Are those getting reinforced beyond standard steel?"

"Partial adamantium reinforcement, yeah," Arista confirmed, tapping the relevant sections. "Not the whole loop, but key structural ribs supporting it at regular intervals, enough reinforcement that the concentrated stress at the inversion's peak has somewhere genuinely strong to transfer into, without needing the entire loop built from the expensive material."

Gorthruk studied the full breakdown, genuinely satisfied with the proportional restraint on display. "This is a considerably more efficient allocation than I expected, given your usual habits."

"I want this built fast, but properly, and I want the Republic's furnaces free again reasonably soon instead of monopolized for months on a single project," Arista said, honestly. "Steel where steel works. Adamantium exactly where the structure genuinely needs it and nowhere else."

Nettle, reviewing her guild's portion of the production plan, nodded along. "My smiths can turn out steel track sections considerably faster than adamantium ones. If most of the build's steel, we're looking at a genuinely reasonable production timeline."

"That's the idea," Arista said, satisfied, rolling up the finalized materials plan. "Let the dwarves handle the adamantium support beams, that's their specialty, and Gorthruk's furnace network's already primed for it. Let your guild and the Republic's general smiths handle the bulk steel production for everything else. Distribute the work according to what each material and each crew actually does best."

"I'll pull a handful of smiths off the ski lift project for this," Gorthruk added, already thinking through the logistics. "That build's comfortably ahead of schedule regardless, forty towers is not a demanding timeline for the Republic. A few weeks' redirection won't meaningfully delay it."

Bram studied the finished plan, genuinely impressed by the sheer, practical efficiency of it. "...This might be the first project of yours that's actually cost-conscious from the very start."

"I contain multitudes," Arista said, entirely too pleased with herself, already directing the crew toward their respective production lines. "Everyone knows their part now. Let's see it come together."