Too many tube crossovers for a medium grid

Disagree. I would have classified it as easy. Confetti in less than half time.

Is this a real grid from OC? Very familiar

Finished with a minute to go. Lovely ideas, but a bit confusing because there are at least two equally valid solutions to the grid. Victoria and Northern can fit into the same two groups, so I wasted time trying to keep them both in the same one of the two as they should be, so the grid would work properly.

I thought this was a lovely fun grid - got the old grey cells going - cheers