过道/走廊 what's the difference? It seems to me that these two are pretty interchangeable for 'hallway' - at least in the writing I've read before.

My question is, though, is there any difference in meaning?

Any difference when to use one over the other?!
For buildings, according to 住宅设计规范(Design code for residential buildings) GB50096-2011,

2．0．13 过道 passage
　　住宅套内使用的水平通道。
2．0．20 走廊 gallery
　　住宅套外使用的水平通道。

So the internal transport space, such as the passageway inside the cinema or train, can be said as &quot;过道&quot;.
And the transport space which is outside the building, independent, covered, can be said as &quot;走廊&quot;.
Except for buildings, &quot;走廊&quot; can also be used for a narrow strip(corridor) connects two areas. Such as &quot;河西走廊&quot;.