Ritchie-your a mind reader, there was a fair bit of shunting to do to get the whole formation together....but it was fun all the same
I'd say the reason the weed spray coach 3187 has been added is that from what I could tell from Sean's video, the lads that are monitoring the Sperry wagon via laptops have now been moved to the weed spray coach instead of the rear cab of the loco as has been the case since the Sperry wagon has been introduced-they can now monitor the wagon in comfort without the need to have to move their equipment every time the loco is detached, plus they now have a mess room area and more space in 3187 to move around.