I got to ride on the Jungfrau Railroad last week while on vacation. According to Wikipedia the train climbs 1,393 meters over a distance of 9.3 km and the maximum grade is 25%.
Most of the route is in a tunnel, but here is a picture of the train heading up the first part of the route:
This is what it looks like at the top:
Here is a quick video of the train leaving the station at Kleine Scheidegg: