Concession Bus card Not A TICKET!

[jasp3r]

Today, the driver of a school bus of a friend of mine was intriduced to me, interest in ACTION being the main topic, he then dashed into his faithful PR.180.2 Mk I and returned with what is the subject of the attached picture
Any ideas how it was used?

Jasper

[Buzz Killington]

Never seen that before.. perhaps one of the drivers could let us know..

[belcodriver]

Nothing to do with concession tickets. Workshops hang those on the handbrake when they want the bus back after your runs.