Don't feel too sorry for me, though, because some of this 'research' was conducted while quizzing (they may say interrorgating!) the carriage builders over a pint or two in the pub.
My main query was about how many tables are in the observation section of 150.
(It was a good job I checked too, because my initial information was wrong!)
With that all confirmed I've been able to have a go at making a master for the main saloon tables.
I'm doing these a little differently and will attempt to cast them in one piece.
The usual superbarn tables I make have a vertical pillar to support the table top along its centre.
For 150, though, I thought I would try to be a little more prototypical.
Although the real ones are fixed to the side of the carriage - not self-supporting like mine - at least there will not be a bloody great pillar to see.
In fact, this is how the smaller free standing tables in the front saloon are made, although I can't promise mine will be as fancy.
There are only two of these - which is part of what I needed to check - but the question is whether I cast them or just make both from scratch?