This mod fixes the drive animation on the stock LNER A4. It’s been bugging me for ages.
Update: Added whistle. Fixed top speed.
Update 2: Fixed crash for non-beta users. The beta installed a new audio utility. I inserted the new whistle into a sound_set for the A4 without realising it used this new utility. This was causing a crash for players who weren’t using the patch beta. Have reverted to the old sound_set utilities until the patch is live. Thanks senyoume for submitting the error report.