OpenRCT2 source: Ride.cpp (ride reliability, inspection, and breakdowns)

https://github.com/OpenRCT2/OpenRCT2/blob/develop/src/openrct2/ride/Ride.cpp

GPL-3.0 reimplementation of RollerCoaster Tycoon 2. Reliability starts at 100% and drops every 256 ticks by the ride's unreliability factor plus an age penalty (one-eighth of it in year 1 up to double after 8 years); breakdown chance rises with reliability lost; weighted breakdown types, brake failure more likely in rain; inspection interval set by the player; repair restores reliability in proportion to its deficit.

Wear and breakdown