Diecast Masters collector guide · New arrivals added October 23, 2026
Heavy-haul displays begin with the transporter. Diecast Masters 85503C puts a Cat CT660 day cab, XL 120 Low-Profile HDG lowboy trailer, and operator together in a 1/50 Core Classics release that gives the truck and trailer plenty of attention in their own right.
An opening hood, removable gooseneck, operating ramps, and removable Oversize Load sign make this an appealing subject for collectors who like to vary the presentation. Its approximately 21.875-inch overall length also makes careful display planning part of the experience.
In this guide: Cat CT660 Day Cab with XL 120 Lowboy Trailer and Operator
Cat CT660 Day Cab with XL 120 Lowboy Trailer and Operator — 1/50 (85503C)
Manufacturer: Diecast Masters | SKU: 85503C | Scale: 1/50
Key specifications: Opening hood; removable trailer gooseneck; operating loading ramps; approximately 21.875 × 2.375 × 2.5 inches.
The Cat CT660 and XL 120 Low-Profile HDG lowboy trailer is a substantial model combination. At approximately 21.875 inches long, it benefits from a dedicated display space where the complete rig can be seen.
The hood opens to reveal Cat CT13 engine detail. A removable trailer gooseneck, operating loading ramps, and removable Oversize Load sign add display possibilities, while the trailer deck reproduces camber. The listing also identifies an operator and Core Classics window-box packaging.
See Cat CT660 Day Cab with XL 120 Lowboy Trailer and Operator — 85503C
A closer look at the Cat CT660 tractor
The CT660 day cab is more than a towing vehicle in this set. The hood opens to reveal Cat CT13 engine detail, and the listing calls out the interior, exterior, and engine compartment. That gives you a choice between presenting a complete working rig and highlighting the tractor’s mechanical detail.
Accurate tire tread and rim detail, authentic logo treatments, and rubber tires are also specified. These are useful elements to inspect in the product photos, especially if you collect transport equipment and want the tractor to carry as much visual interest as the trailer.
Why the XL 120 trailer deserves its own attention
The XL 120 Low-Profile HDG lowboy features a removable gooseneck and operating loading ramps. The deck replicates camber, and the Oversize Load sign can be removed. Those details let you consider more than a single static configuration when planning a scene.
Give the trailer enough space to show its shape and loading features. The overall combination measures approximately 21.875 inches long, 2.375 inches wide, and 2.5 inches high; those measurements do not specify the usable loading area or the space needed when components are moved.
Choosing a load: scale is only the first check
A 1/50 machine may look like an obvious companion, but matching scale does not prove that the model fits the trailer. Check the machine’s wheel or track placement against actual usable deck measurements, along with overhang and clearance.
The separately sold Komatsu GD955-7 introduced in the same new-arrival group is approximately 4.5 inches wide overall. That is a useful reminder to measure rather than assume. No equipment load is listed as included with this Cat truck, trailer, and operator set.
Core Classics packaging and display planning
The Core Classics packaging is described as an unbleached cardboard window box printed with a machine photo and specifications. A molded PVC blister protects the model, with an additional cardboard outer box. This is packaging information, not a claim that a separate acrylic display case is included.
If the rig will be displayed outside its packaging, measure a cabinet’s usable interior length first. Allow room near the hood, gooseneck, and ramps so the model’s moving and removable features remain accessible.
Ordering Diecast Masters models in the USA
Canadian Die Cast currently ships to United States addresses through a U.S. distribution network. The current policy includes free U.S. shipping with no minimum purchase and estimated delivery of 3–5 business days from order to delivery. Delivery estimates are not guaranteed.
A residential or business street address is required; PO boxes are not supported. Check the individual product page for current availability and review the U.S. shipping policy before ordering.
Diecast Masters collector FAQs
What is the model number?
The Diecast Masters Core Classics Cat CT660 with XL 120 lowboy trailer and operator is 85503C.
Does the hood open?
Yes. The listed opening hood reveals Cat CT13 engine detail.
Is the trailer gooseneck removable?
Yes. The listing specifies a removable trailer gooseneck and operating loading ramps.
Does it include construction equipment as a load?
No equipment load is listed. The named set includes the truck, trailer, and operator. Any proposed load should be checked for fit and purchased separately.
Choose your next Diecast Masters model
Choose 85503C when the transporter is a subject you want to study and display in its own right. Its long footprint, opening hood, and trailer features reward planning a space around the complete rig.
Cat CT660 Day Cab with XL 120 Lowboy Trailer and Operator (85503C)
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Specifications checked against Canadian Die Cast listings on October 23, 2026. Dimensions are approximate. Products are sold separately unless a product listing specifies an included set. Availability and shipping terms can change.