Cycle Planning

In general the following sites can help you. Country specific sites follow

Trains

I’m starting off with trains as getting home from a leisure cycle is good with trains.

Seat61 – will tell you bike on train rules for any country in Europe

Loco2 – this site allows you to buy tickets on regional trains and compare various prices. Does online tickets for quite a few countries

Rome2rio – will gove different options for getting from A to B.

Cycle Planners

mapmyride has good elevation data

Europe

Bicyle Routes and Tours has 723 long distance routes in Europe with lots of useful information about sights and attractions

Italy

Pisteciclabili.com – lots of cycle routes with elevation ( in Italian)