nova l - single-girder trolley, compact design the compact nova l single-girder trolley offers optimal installation and approach dimensions and easily accessible electrical and wearing parts. the electric wire rope hoist ......nova l - single-girder trolley, compact design the compact nova l single-girder trolley offers optimal installation and approach dimensions and easily accessible electrical and wearing parts. the electric wire rope hoist has a modular design without any welded parts. amongst other advantages, it ensures optimal motor cooling even at extremely high power.