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So if I'm understanding correctly, it's less of a siding and more of just a very long crossover? i.e. vehicles have to run into the Velopark platform, reverse there, then pass over the "siding" to cross back onto the inbound line?
In that case, why don't the trams run to Velopark in service and terminate there instead of Etihad?
The reason for not starting/terminating at Velopark is because you can’t start a service from there. Taking passengers through the siding, whilst technically possible, would be undesirable due to turnaround time being taken once the set is in the siding.
So you’d end up with a service that ends in one place but starts in another.