real big hit it would be.
if nothing more, than signals bridges..
I would even like it if the bridge would have the same signal "logical" all the way as the first signal it has.
annoying that only 1 train can go on a bridge at the same time.
as for diagonal bridge and tunnel.. would be just awesome, but it would require new graphics, new tiles

loads of work...
still, i was thinking i ask opinions on how feasable would these be, anyone else would like tunnel accepting more than 1 train, same for bridges, and hows about diagonal tunnels/bridges.
it would be lovely lovely.. just as a major improvement as the diagonal track under a bridge.
gotta love that too. Y shape bridges do exsist in real world, and OTTD could use those too.
large hubs, and densid junctions would look a bit more nice too WITH!!!!! diagonal bridge/tunnel options.