I'd say deep red and dark red are two different colors. A dark red means it's closer to being black, but deep red is a stronger, more vibrant, more pure, less pale red, that also happens to be darker. The difference between the brightness slider and the saturation slider.
To me, at least, orange is specifically reddish yellow, not just deep yellow. You can have a very pale orange color; it's not necessarily deep at all. If anything, I'd say very deep yellow might become brown, but definitely not orange; the distinction between yellow and orange has nothing to do with deepness.
https://www.exoticvoyages.com/blog/houses-vietnam-painted-yellow-34653.html it's a very common color for buildings in vietnam
After seeing this sentence more times than I can count, I was curious is such a train station really exists. It does, but it's made out of Legos: http://www.brickshelf.com/gallery/Superb/trainstation/pa244321.jpg
Yellow buildings are quite common in Vietnam, because of symbolic reasons, and many buildings from certain periods of time tend to have a deep yellow color. I saw a Vietnamese friend be very curious about a house in my village with that colour and even more so at Wroclaw's Glowny train station, which appears to be very matching to that time's style. This sentence applies very well to it, so it's not just in Legos.