Can I mix code 100 and code 75 track sizes?

For anybody who doesn't know the difference, code 100 track is the standard OO gauge model railway track. Code 75 track has smaller rails to better represent the prototype and is usually referred to as finescale track. But can the two types be mixed on a layout?

The answer is yes, they can. Although aesthetically it would be advised to create your layout using a single track option, not everybody has the foresight or budget to create a perfect world layout. And for that reason, a little transition track is produced to connect code 75 track with code 100.

It should be pointed out that it is necessary to use the transition track (Peco SL-113), otherwise the sudden jump in rail profile will likely cause derailments, and lots of them. It should also be pointed out that not all older rolling stock will run on code 75 track due to wider and deeper wheel flanges. So if you are considering adding some code 75 track to your layout, get a small test piece first to see if your engines and wagons run on it smoothly.