Carleton (Diamond)

Carleton's diamond sits right beside the sidewalk on Monroe Street, making it one of the most accessible grade-crossing diamonds in southeast Michigan. The CSX Saginaw Subdivision runs north-south through town as a double-track main (Track 1 and Track 2), while the former DT&I line — now operated by the Indiana & Ohio Railway (IORY) — crosses east-west on its way between Delta, Ohio and CN's Flat Rock Yard. Just north of the diamond, the Conrail Lincoln Secondary branches off to the northeast toward Ecorse Junction and the Detroit area.

The diamond itself is a compact crossing with cantilever signals on each approach. Trains approaching from any of the four quadrants give ample horn warning, and the distinctive clatter of wheels hitting the frog gaps is audible well before a train arrives. A scanner tuned to CSX's AX dispatcher on AAR Channel 8 (160.230 MHz) covers Saginaw Sub traffic north of Carleton, while the BX desk on AAR Channel 35 (160.635 MHz) handles the Toledo Terminal Sub south of town and the Lincoln Secondary. The old brick interlocking tower, with its windows now covered in corrugated sheet metal, stands northeast of the diamond as a tangible reminder of the days when operators manually lined routes for three different railroads.

Carleton is a small village of roughly 2,300 residents in northeast Monroe County, surrounded by flat agricultural land typical of the western Lake Erie basin. Elevation sits around 620 feet, and horizons are wide in every direction — soybean, corn, and alfalfa fields stretch to distant treelines of maple and cottonwood. The railroad corridor cuts through the center of the village, with Monroe Street running east-west across the tracks. A Circle K, a pizza shop, and the Carleton Hotel Bar — a local dive with food and weekend entertainment — line Monroe Street just west of the crossing. The flat terrain and open farmland mean that headlights from approaching trains are visible from a considerable distance, giving railfans time to set up. Weather follows Great Lakes patterns: warm humid summers, colorful fall foliage season, and winters that occasionally bring lake-effect snow, which can create photogenic plume shots as locomotives push through powder.

The main action at Carleton is CSX freight on the former C&O/Pere Marquette Saginaw Subdivision. Based on railfan reports and published train symbols, the Saginaw Sub through Carleton handles an estimated 15 to 20 trains per day, though this varies significantly. Key CSX symbols that regularly pass through include intermodal trains (I150, I151, I131, I132), manifest freights (M510, M511, M567, M568, M209, M215), and local/unit trains (B522, B523). Traffic is predominantly autoracks, intermodal, and general merchandise, reflecting the Detroit automotive industry's demand. Occasional BNSF-contracted Powder River Basin coal trains also use the line.

The east-west crossing line is the former Detroit, Toledo & Ironton, now operated by the Indiana & Ohio Railway (IORY) as a shortline. IORY runs approximately 2-3 turns per week between Delta, Ohio and CN's Flat Rock Yard — train symbols A401 northbound and A400 southbound. CN itself no longer runs freight south of Flat Rock Yard on this line. The Lincoln Secondary, branching northeast from just north of the diamond, sees occasional CSX through trains (some I131/I132 movements) and local jobs serving industries along the route toward the Detroit area.

The diamond's location right on Monroe Street allows photographers to work from multiple angles without trespassing. For morning shots, position on the east side of the tracks to catch northbound CSX trains with the sun behind you. The old interlocking tower can be included as a background element from the southeast quadrant. Late afternoon light favors the northwest side for southbound consists. A standard zoom in the 70-200mm range works well for locomotive portraits at the diamond, while wider lenses (24-50mm) can capture the full crossing geometry, including both signal bridges and the intersecting track infrastructure. Crossover moves between Track 1 and Track 2 happen regularly — trains headed to or from New Boston Intermodal Terminal often use the crossovers at Carleton, adding visual variety. Speed through the crossovers varies from 15 to 30 MPH depending on the switch, so you'll have time for multiple frames. The flat terrain means a telephoto from a few hundred yards north or south can compress the approaching train against the village backdrop.

Carleton's railroad heritage dates to 1873, when the Flint & Pere Marquette Railroad opened its line between Detroit and Toledo through the village. The Chicago & Canada Southern Railway (later the Detroit, Toledo & Ironton) crossed the PM here, and in 1912 the Michigan Railroad Commission approved the formal crossing arrangement. In the 1920s, the Pennsylvania Railroad built its cutoff from Carleton northeast to Detroit (the Lincoln Secondary), using PM trackage rights between Alexis, Ohio and Carleton. This made Carleton a three-railroad junction.

In 1926, the Pere Marquette installed a 36-lever Model-2 electric interlocking machine from General Railway Signal Company, with 26 working levers controlling 16 switch machines and multiple color-light and position-light signals. The tower controlled all three railroads' movements through the interlocking. During the 1970s, Penn Central trains used the junction to reach the Lincoln Secondary, and operators in the tower managed conflicts between the C&O, DT&I, and PC. The tower was remotely controlled in the early 1990s by CSX dispatchers in Jacksonville, Florida, but the brick structure still stands today — its windows sealed with corrugated metal, a well-known photo prop for visiting railfans.

What makes Carleton distinctive among Michigan's railroad diamonds is the combination of its sidewalk-level accessibility, historic interlocking tower, and the convergence of CSX mainline traffic with the IORY shortline. Unlike the busier diamonds at Romulus (NS/CSX) or Wayne (which sees six crossings), Carleton offers a quieter, more relaxed atmosphere — though this means patience is required between trains. The variety of equipment passing through includes CSX's own fleet, occasional foreign power from Norfolk Southern or other roads, and IORY shortline power on the east-west line.

For railfans based in the Detroit metro area, Carleton makes a natural pairing with nearby diamonds at Romulus (9 miles north on the Saginaw Sub) and Milan (about 20 miles west), where the NS ex-Wabash crosses the Ann Arbor Railroad. The village itself has basic amenities — a pizza shop and the Carleton Hotel Bar near the crossing provide food options, and the Circle K handles refreshments. Experienced local railfans note that afternoons tend to be the busiest period, and patience on slower days can be rewarded by unexpected unit trains of coal, grain, or military equipment that occasionally supplement the regular traffic.