"Padded cell" coaches

Until 1959, TR used series of coaches with small windows. These coaches were nicknamed by locomotives, passengers and railwaymen as "padded cells" since some were used in prison transport or on funeral trains.

History
It's mostly unknown when the first of these carriages was built or arrived on Nerland but by the 1880s, a group of carriages with small windows began to be noticed on Tri-ang Railways made from some "Second-Gen" coaches with reduced passenger comfort after some were seen on standard passenger trains. According to staff, the coaches were designed to handle criminals or as coffin carriers on funeral trains but were used on passenger service when there was a shortage of carriages. Their convict transport role and small windows earned the coaches the nickname "padded cells".

Basis
The "padded cell" coaches are based on various type of four-wheel coaches used across the United Kingdom from the 1870s to the late-1930s when they were withdrawn from passenger service and replaced by more larger and modern bogie coaches. They could be based off prison coaches or "convict vans" as inspiration of their small windows and prisoner transport role.

Trivia
The nickname "padded cell" was used in real life on the early carriages of the City & South London Railway (C&SLR) as these carriages had small windows and uncomfortable seats. They were soon replaced by carriages with larger windows and better seats.

The "padded cells" are made from various models with their windows reduced towards the top.

It appears that some "padded cells" were used by the fabled Thorndyke Corpse Railway as two were found by Jack after he wondered into the abandoned line under the city.