5 ms·
At these speeds, the train would need to drive in a low pressure tunnel.
by hojijoji 7y ago
At these speeds, the train would need to drive in a low pressure tunnel.
- NamTaf 7y agoIt’s worth noting that this isn’t necessarily that big of an issue for China. A lot of their HSR is grade-separated and not infrequently up on viaducts. It’s not a particularly big step in my mind to enclosing that.
- gnode 7y agoI'm not sure it's strictly necessary to have the tunnel be low pressure. It's nice for the sake of less resistance, but the speed of sound is actually lower at lower pressures, and so would more readily produce a sonic boom.