German to English Tech/Engineering Aerospace / Aviation / Space Aircraft engineering

Context:

"Die betreffende Baugruppe wird ausschließlich im Bauteilewagen transportiert"

In the specifications (Lastenheft) for an installation (cf. http://www.proz.com/kudoz/4445683 etc.).

I expect that this may be "part trolley/cart/truck" or "component trolley/cart/truck", but can't find any evidence to back such a literal translation up. Can anyone confirm what these trolleys are actually called in the industry? I seem to remember trolleys also being referred to as "dollys" in some contexts, may that apply here?

* Sentence or paragraph where the term occurs: See above
* Document type: Performance specifications
* Target audience: Engineers/contractors
* Country and dialect (source): Germany
* Country and dialect (target): American English