For efficiency, I suggest that all the delayed trains should be showed on the front page (in a separate list) so that users don't have to manually click through each of Red/Green/Orange/Blue line to find out if there's delay in individual line.
If there're no delays in the entire system, then there's no need for the users to click any of the mentioned lines to find out.
For efficiency, I suggest that all the delayed trains should be showed on the front page (in a separate list) so that users don't have to manually click through each of Red/Green/Orange/Blue line to find out if there's delay in individual line.
If there're no delays in the entire system, then there's no need for the users to click any of the mentioned lines to find out.