Welcome to our new web site! We manufacture urethane cast tunnel portals, retaining walls, abutments, culverts, bridge piers, and much more for all the popular model railroading scales. We invite you to browse our product line below.

Free Shipping

Due to the HUGE success of offering free shipping with our products, all orders over $25* will be shipped free of charge. Reduced shipping costs for international orders.
*(excludes tree armatures; excludes dealers)


Our products are made of high-quality resin, which is very strong, almost unbreakable. They may be colored or stained with everything from dry powders to any paint (after thorough washing). Many are used right from the package because they already look like weathered wood, concrete, or rock.


We now carry tree armatures. These are mostly sagebrush twigs, with a few saltbush. Each one is different, so they are individually photographed and numbered. Since these are one-of-a-kind armatures, they are subject to prior sale. Please note that these are shipped at actual cost (you will be notified of the shipping cost before your order is actually processed).

Contact Us

Feel free to contact us at any time. For a little bit more info about our company, we have added an About Us page.


Dealers can now conveniently order online via our password-protected Dealer Portal. To establish a new dealer account we will need your contact and shipping information, and a copy of your resale license (more dealer terms-of-sale are found on the Dealer Portal page, or contact us for more info).

Browse Securely

Even though we don't handle financial transactions directly on this site (we use PayPal for that), it is still best, for your own privacy, to browse a web site securely. To do so with our web site, be sure to use the secure version https://www.pre-size.com/ of our web site (note the letter "s").

Our Product Line

We encourage you to purchase our products from your dealer. However, if your dealer doesn't stock our products, you may purchase them online via this web site.

In the product detail pages, click on the photos to see a larger version (where available).

We have over 250 unique products available for purchase today!

Recent Announcements

July 3, 2024: We are announcing the unique S-scale Haliburton car kit # PS599.

February 26, 2024: Today we are announcing two S-scale ends. One is the Bettendorf Gondola Ends (PS598), and the other is the 5/4 Box Car Ends (PS597).

May 1, 2023: We are pleased to announce our new C&O high-sided gondola kits in S-scale. These are available with four different ends.

March 12, 2023: Today we are announcing the new S-scale TTCX flat car kit, #PS595. We now also have available S-scale archbar trucks #PS569.

May 8, 2022: Today we are announcing kits for five different road names of the new S-scale centerbeam flat car kit, #PS594.

March 2, 2022: We have added another S-scale box car end to our growing collection: #PS568.

February 15, 2022: Continuing to expand our S-scale freight car parts, we are now offering these three housecar ends for your kit-bashing/scratchbuilding efforts: #PS564, #PS565, and #PS566,

February 12, 2022: We are pleased to announce the S-scale T-section Bettendorf trucks (part #PS567).

January 22, 2022: We have two new hopper/gondola heap shields available for S-scale. Part #PS562 is a regular heap shield, while part #PS563 is a notched heap shield used on some cars.

We also accept checks and money orders. Please allow time for the check to clear our bank.

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