But still we have plenty of options for 'Non-drivable connected to drivable' check:
1. We can exclude dead-ends up to 300 m long.
2. Or we can enable check #115 just for some countries by request.
3. Or we can report just railroads connected to drivable roads.
I would go for #1; but the summum would be a recursive dead-end-check
Railroads are ALWAYS to be reported if connected to something drivable. As there are a number of countries that have substituted railroads by walking trail (with a distinctive name like "spoorlijn" or "railroad") those should be treated equivalent to RR.