Newly built Metroliner question

A LEGO fan encountered an unexpected variation while building the LEGO Metroliner set 10001. The builder discovered that the set included trans-light blue train windows instead of the expected clear windows.

The original poster, /u/Agreeable_Fault9078, swapped doors from set 4558 and noticed the discrepancy in the window color. Upon checking Bricklink, the user found that trans-light blue windows were listed as an alternate part for the set. This detail had not been previously mentioned.

This discovery highlights the potential for variations in LEGO sets, even in older models. It's a reminder for LEGO enthusiasts to be aware of possible differences in their sets, especially when dealing with older or less common pieces. If you're building older sets, you might want to have some brick separator tools handy.