I've recently finished assembling a
Helmer for the side of the desk, which turned out to work really well. Like the cabinet, it has (non swiveling) casters to make it easier to move. The drawers themselves have a great horizontal and vertical depth and slide very easily (with the exception of the lowermost for mine). To make them removable when needed, I chose not to fold the side tabs. However, the whole unit is a type of metal that makes fingerprints near permanent, and the way the rails are mounted makes them very prone to falling off. Despite the shortcomings, I'm quite happy with it.
I initially loaded the TOMY/TrackMaster engines vertically (like they've been stored until now), but most turned out to be too long and had to be placed on their sides. Same with the coaches and trucks in the drawer right after it.
On the other hand, their Take Along/Take 'n Play counterparts
can be stored the way I intended. Currently, the other three drawers contain most of the other stuff from the original piece of furniture (a dedicated "toy" organizer I hope to remove after all its contents could be transferred. Some of the plastic boxes from it are broken due to sun damage from big windows).