Design proof-of-concept. Drive west, take a branch to find the radio operator, keep the train fuelled, warm, and repaired.
Drive with the levers (drag): THR power · DIR Rev/N/Fwd · BRK brake (top = emergency).
Keys: ↑↓ throttle · ←→ reverser · Space brake · 1 2 4 8 time.
Trees: plow (costs HP+speed) or stop & clear on foot. Rocks: clear on foot.
On foot: WASD move · Space action. Stand at the loco front to Repair.