The ArcJet engine transport appears only in Fallout 4.
- Fallout 4 Vault Dweller's Survival Guide Collector's Edition p.323: "[3.19] ARCJET ENGINE TRANSPORT
A big-rig with a flat trailer is carrying one of ArcJet’s impressive engines. What would happen if you could access a terminal here and switch the engine on?"
(Fallout 4 Vault Dweller's Survival Guide Map)