Factorio Forums

In the train stop gui there is this checkbox to limit the trains that this stop will accept.
Checking it makes the text-field behind it available to typ in a limit.
Left-mouse button to activate the text-field and make it yellow.
Pressing 'enter' does not accept the input and doesn't make it grey again.
Left-mouse button anywhere else does.
It will accept the new vallue when closing the train stop gui with the 'e'-key while still yellow,
but I keep pressing the 'enter'-key to accept the new value and deselect the field, which doesn't notify me.

This is the same with other number fields, such as blueprint grid settings, which makes me think it was intended.

The value is updated in the real time, so the only effect of enter in the textfield would be to close the gui. But generally we don't do it for fields that are updated in the real time instead you are supposed to close it with the (E) key.