>>1488347Don't have any particular recommendations as for books or documentaries (shouldn't be too hard to find though, especially as this is the period where pretty much all colour videos of BR steam come from), time period is roughly 1964-1968.
This RMweb thread has a good collection of photos for inspiration (as well as boomers angry that anyone would dare model the era):
https://www.rmweb.co.uk/community/index.php?/topic/52572-why-is-this-so-rarely-modelled/ 