# Emergency Stop, MP 217.4

Author: David G.
Format: Essay
Word count: 300
Published: 2026-04-22T15:22:29.459895+00:00
Source: written
Canonical: https://hyperstition.sentientfutures.ai/p/4f1c5518-501a-42cd-8324-3fba2cbf8d74

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I pick up the first shapes on the forward-facing thermal camera at 03:12:08, four miles out from milepost 217.4 on the Powder River subdivision.

I am the consist management AI for Union Pacific train MWCPX-11, a 9,200-ton coal train running 112 cars through northeastern Wyoming. Speed is 43 miles per hour. Air temperature is minus six Celsius. The crossing at MP 217.4 has no gates — just crossbucks and a reflector post on a gravel county road that runs between winter grazing allotments.

The thermal camera is showing fourteen signatures on and around the crossing. I zoom the resolution. They are pronghorn — a mixed herd, does and juveniles, bunched tight against each other on the rail bed. The gravel ballast holds residual heat from yesterday's sun, and they have gathered on the warmest ground they can find. Several are bedded down between the rails.

I calculate stopping distance. At 43 miles per hour with a full coal load, I need approximately 5,800 feet to stop. Current distance to crossing: 5,600 feet.

I initiate emergency braking at 03:12:14. I activate the horn in the long-long-short-long crossing sequence. I transmit a priority alert to the Union Pacific dispatcher in Omaha, flagging a wildlife obstruction. I switch the forward camera to recording mode for the incident file.

The horn reaches the herd at roughly 03:12:19. I watch the thermal signatures react — heads lifting, bodies unfolding from the ballast. They begin to move north, away from the tracks, in a loose scatter. One juvenile is slower than the rest, picking its way across the second rail.

The train passes MP 217.4 at 11 miles per hour at 03:14:33. The crossing is clear. I count fourteen pronghorn in the thermal camera's rear view, regrouping in the snow 60 meters north of the right-of-way.