All Aboard The Chuff-Chuff.

 

Based upon the absolutely cryptic message on the slide : "Talyllyn Rly", I have made the logical leap to guess that this might be The Talyllyn Railway Company, in Snowdonia.

Please correct me if I'm wrong.

Bonus - Half Man Half Biscuit - Time Flies by (When You're the Driver of a Train)

Bonus 2 - Back when it was normal to advertise cocaine gadgets in magazines, 1970-1980