A trolleybus having troubles and slipping due to wet snow mud on a light grade. But this is quite unexpected behavior for usual trolleybus because there are many buses with automatic transmission, as well as ones with manual gearbox, including articulated with mid or tail driving axle, all of them climbing the same grade without such hard wheelslip. Hence, the road surface isn't really so slippery to completely prevent climbing. The only reason should be that this specific type of trolleybus has a feature always to start very roughly and couldn't do it in a more soft manner :)
Trolley bus burnout
Trolleybuses in the snowy Switzerland
Just lots of swiss trolleybuses and snow =) Happy New Year 2007!
Trolleybus tire burnout in Bratislava
Trolleybus from Solingen-Line 683 Burg turntable
Video showing the turntable on line 683 where there is no room for a
turning loop, check this clever way of "returning" the vehicles. More info