Hi,
In 1968, while I was still at school, we used to travel quite often on the 1900 from Glasgow Queen St, to Edinburgh for the 2020 Edinburgh to Kings Cross on a Friday night. This train was normally a Toton Peak to Newcastle and a Deltic forward to Kings Cross. It had about 5 passenger coaches and 6 vans. It arrived in Kings Cross just before 0500 usually. We then spent the day in London and returned overnight on Saturday night from St. Pancras to Glasgow getting into Central about 0900 on Sunday morning. The good old days.