Would someone explain what is the difference between MKI and MkIII gangways referred to in the thread?
Secondly for clarity are the terms "Steam Heating Van" and "Heating (& Luggage) Van - HLV" synonymous, I.e have a boiler for the production of steam only for train heating, with train lighting being provided by dynamos on the bogies?
If so, is the term Generating Steam Van (GSV) synonymous with the terms above or do these vans have both boilers for heating and generators for electricity to provide lighting e.g. Train Line (TL) on Cravens and earlier stock
With the introduction of MkIId's, MkIIa's & MkIIIs, lighting and electric heating was by means of the appropriate MKII, MKIII EGV or Converted/Rebuilt Dutch EGV(?)