Rey Mohammed: Any sources for that? I've heard quayside locomotives called dock tanks; mules & tuggers but have never heard nor seen "bulgine" used in that context.

Fyi: The standard combustion engineering definition of 'bull engine' is a pendulum pump; originally known as a Bull's Engine, after the pioneering Cornish engineer Edward Bull (1759-1798) an associate of Richard Trevithick and one-time subcontractor to James Watt.

It's a fixed, stationary, dewatering mechanism, ie: no need to "run with" or "get out the way."