Hi Failsafe,
A bit more or you:
Sadly very few carriages from the 1860's have survived. The oldest MR Carriage in the National Colection, a six wheeler, dates from the 1880's. The Oldest LNWR one may not really be relevant as it is a Royal Saloon!
Locos are a bit easier Columbine in the National Collection is a good example of the 2-2-2's that ran on the LNWR. Another interesting LNWR 2-2-2 was The Bloomer Class. A replica is being built at Tyseley, see
http://www.vintagetrains.co.uk/tlw_bloomer.htm
Other LNWR 2-2-2 locomotive classes of the period were "The Problem Class" and the elegant "Lady of the Lake Class".
2-4-0 locos like "Hardwicke" in the National Collection were beginning to appear in the early 1860's.
Midland Railway posibilities would be 2-2-2's by Kirtley and his 2-4-0's were also beginning to appear. Again there is one in the National Collection (2-4-0).
So there you are. Photographs and drawing are rare buit do exist.
The locos I have mentioned had very spartan cabs, often no roof, just a weather board.
Best wishes,
John H-T.