Seconded!  I've been asking for a real model of a 2-6-2, not that smoking 0-6-0 with pilot and trailing trucks stock on, for years.

Len

You should be able to fit anything using O-99 (8'3" circle) curves, or smaller, inside a 10x10 LS layout.

Len

There should be two track pieces labeled 'A' on one end and 'B' on the other. These are the sections with the gaps that trigger the reversing action.  All the other sections should be labeled 'A' on both ends and have the black channel on the bottom that carries the wires connecting the reversing module to the 'A'-'B' track sections.

The special reversing track 18" radius curves are item 44549.
The special reversing track 9" straights are item 44548.

Regular EZ-Track, without the connecting wires will not work properly with the reversing unit unless you add the additional wires yourself.

Len

Check to be sure you do not have one of the A-B reversing section install backwards. Both of the gaps in the A-B sections should be on the same rail.

Instructions: https://www.bachmanntrains.com/home-usa/dwg/dwgs/HOReversingTrackInstructions.pdf

Len

There is no direction lock switch on Williams, or early Williams by Bachmann, locomotives.  To add a switch you can replace the original reverse board with the newer version that has provision for adding a direction lock switch.

New board: https://estore.bachmanntrains.com/index.php?main_page=product_info&cPath=77_222&products_id=10587

Installation instructions: https://www.bachmanntrains.com/home-usa/dwg/dwgs/WilliamsReverseBoardInst(later).pdf

Len

For the passenger cars, gently squeeze the side of the roof-you can normally "pop" the tabs free of the side and just lift away, one side at a time. If needed, you can use wooden tooth picks inserted between the roof and sides to keep it from dropping back in place while doing the opposite side.

No clue on the caboose, as I do not own one.

Len

If it's used, have you tried a factory reset to clear any previous programing, such as an address change?

Len

One source:

https://www.tichytraingroup.com/Shop/tabid/91/p/10269-nw-611-steam-engine-decal/Default.aspx

Len

The '48 and '49 pieces have the wiring underneath for completing the autoreverse electrical connections. Standard EZ-Track does not.

Len

YOu could make your own spring using brass, or bronze, strip material like that available from K&S Engineering, and other sources.

Len

Yes. You have to remove the EZ-App PC board and replace it with the decoder of your choice. Make note of which wires come from the trucks and go to the motor and lights before you disconnect anything.

Len

If it is happening at the same point, and the unit in question passes it at higher speeds, I would suspect either a dirty spot on the track, or a track joint misalignment, the one unit is more sensitive too than the other one. I would clean the spot in question, and check the joint alignment as first steps.

Len

Short answer, yes.

I've done the same on several display layouts built over the years for the train store where my repair shop was located before I retired.

Len

Weaver used a QSI electronic reversing unit, similar to early MTH O-gauge locos before they came out with their Proto Sound series of reverse/sound boards.  They switched because there were a lot of issues with the QSI boards.

There should be a direction lock switch connected to the board, which may be hidden by one of the tender trucks, or be inside the loco cab. If the switch is missing, it may have been removed by someone who wanted to keep the loco locked in forward, without the chance of someone accidentally moving the switch.

If there is no switch, or you find the switch and the loco still will not change directions after moving it the the opposite position, you might consider replacing the board with with a Bachmann reverse board, which has provisions for adding a direction lock switch if you want one.

https://estore.bachmanntrains.com/index.php?main_page=product_info&cPath=77_222&products_id=10587

Len

A Weaver brass loco would be 3-rail O-Gauge for an AC layout. If the OP is trying to operate it using DC the electronic e-unit will not trigger properly, giving forward only travel.

Len