Converting Bachmann On30 cars to O or O27?

Last Updated on July 23, 2023 by Dave Farquhar

There’s always a discussion about the cost of O gauge/O scale somewhere, mostly because it’s hard to find new locomotives for less than $500 and new train cars for under $75. You’d think this was a hobby for trial lawyers and brain surgeons.

One guy pointed out how much bang for the buck he’s getting when he buys On30.

Now, a bit of terminology here. O scale is 1:48 scale. One quarter inch on the model is equal to a foot on the real-world equivalent. O27, the cheaper brother of O scale, is actually 1:64 scale, though it runs on the same track. “Serious” hobbyists often look down on O27, but the nice thing about O27 is it lets you pack a lot more into a smaller space.

So what’s this On30 stuff and what’s the difference between it and regular O or O27 scale?

I’m glad you asked.

On30, On3, and the like refer to “narrow gauge.” Most train track in the United States has its rails 4 feet 8 inches (or 8 1/2 inches) apart. That’s “Standard gauge.” Occasionally, a railroad would lay its track 3 feet apart, or 30 inches apart, or some other measurement narrower than 4’8.5″. This was especially common out west in regions where they had to deal with a lot of mountains. On30 refers to 1:48 scale models of 30-inch gauge trains. On3 refers to 1:48 scale models of 3-foot gauge trains. On2 refers to 1:48 scale models of 2-foot gauge trains. And so on. I’ve talked more about On30 here if you want to know more.

Now it just so happens that the distance between the rails on regular old HO scale track measures out to 31.3 inches in O scale. For most people, that’s certainly close enough. O scalers have been living with track that’s 5 scale feet wide ever since we decided that O scale was 1:48, back in the 1930s or so.

So Bachmann, the makers of the cheap HO and N scale train sets you see in big box stores, decided to take advantage of this convenient accident, make some 1:48 scale cars, put narrow trucks on them, bundle some HO scale track and commercialize On30. So now it’s actually easier in some regions to get a Bachmann On30 train set than it is to get a Lionel O train set.

I found this page on converting Bachmann On30 cars to S scale. What the author did was remove the Bachmann trucks and couplers and substitute American Flyers. Since S scale stuff is even more scarce than regular O scale, this is a slick trick. And, as you can see from the pictures, for the most part the stuff still looks right. Rivet counters won’t like it, but if you’re a rivet counter you’re probably not reading this page anyway. For people starved for inexpensive trains, or for trains, period, they’re fine.

Well, I like my Lionels. I’m not going to convert to On30. But I don’t like Lionel prices. So I build some of my own stuff, and the stuff I do buy, I buy used. So I’ve amassed a pretty sizeable collection, even though I’ve spent a lot less than most hobbyists will spend on a single locomotive.

But I’m always looking for something new and different.

A K-Line passenger car costs $117. A Bachmann passenger car costs $28.

A pair of K-Line freight trucks costs $8. Are you thinking what I’m thinking?

You can’t put freight trucks on a passenger car. That’s what I’m thinking. Freight trucks are different from passenger trucks for some reason. Something about people wanting a smoother ride than cows.

But you get the idea. $36 is a lot less than $117.

K-Line passenger trucks are $25 apiece. That’s more than the car. But $78 is still less than $117, though I’d just live with using freight trucks, myself.

If the S scalers can do it, why can’t we?