Today I had to visit a facility about 120 km away in a kind of rural area. I also had to bring about 20 kg worth of equipment. I took my Muli cargo bike and the train.
The equipment is 4 height units worth 19" rack devices, a whole bunch of cables and tools. That all fits in a 60x40 cm Euro box, which fits nicely into the front basket. Secured with a ratchet strap, good to go.
I left home fairly early around 6 to catch a direct train half an hour later. The train departed in my hometown so it was already waiting when I arrived and I got time to unload the box and board the train.
Nominally no cargo bikes are allowed on German trains. But no conductor ever had an issue with my folded Muli. Its about as big a regular bike.
1,5h train ride. The facility is about 8 km away from the station and the route took me through a small city, a little village with a mill, nice fields and tree-lined cycle paths.
The return trip in the evening was not so smooth. Much more stressful to board with two heavy pieces when the train is not already waiting at the platform. Many more people on the train and bikes in the bike section. The direct train got delayed by an hour so I switched to a route with two changeovers. But then I had to carry my stuff up and down stairs because of broken or crammed elevators. That was no fun. But hey people are really nice and I got help a bunch of times.
In the end I rode home safely with my equipment. Overall nice experience, with a few downs. Might do it again on occasion.