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 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.

Contact Us

Feel free to contact us at any time.


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 our products online via this web site.

Recent Announcements

April 18, 2019: We now have an N-scale set of lumber stacks available.

March 29, 2019: We are happy to announce our newest S-scale freight car, the Greenville 52'6" gondola. Follow the link in the description for the instructions PDF.

March 8, 2019: Today we are announcing the new HO-scale Hoosac Tunnel West Portal.

March 8, 2019: The S-scale passenger car parts have been expanded with the following parts: PS546, PS547, PS554, and the reworked PS533.

November 19, 2018: We have a new S-scale tunnel portal available, the Stone Double Tunnel Portal, Lehigh Valley Prototype.

October 1, 2018: The initial run, with its introductory price, of the S-scale TTX 60' flat car has sold out, so a second run is being produced now. Also, the instructions have been updated.

September 25, 2018: We are pleased to announce our next S-scale freight car kit, the TTX 60' flat car.

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

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