In case you dont know on Northern Trans Pennine one of the Achievements is “Reach Level 20 on NTP” which is Called The Magic Number so why is 20 the Magic number?
All I know of 20 & Magic Numbers is a physics thing. I won't go into it because I can't be bothered typing it out, but you can look that up. But I highly doubt that's the reason the achievement's called that.
Because they are/were absolute beasts! All 228 of them, the English Electric, nuclear (or conventional) bonnetted, hanging around In pairs, whistling wardrobes! *not my pic!