That’s exactly right, thanks.
The general format at club running days, is that you sign in for timed 20-minute running slots, through the day. With 7 or 8 loops, about 50 members present and about 70 locos and various trains, you need a quick turn-round. It doesn’t work QUITE that smoothly but everyone seemed happy enough at the all-day session. Monthly sessions are smaller and shorter, but the same principle.
”basement empire” type layouts are rare in U.K. and few clubs can achieve full-time occupancy of the premises, so the opportunity to run long trains is the attraction.