Top DoD railroad rolling stock manufacturing contractors
In the 12 months ending Oct 5, 2026, the Department of Defense obligated $23.7M in net prime contract dollars under NAICS 336510, up 186.6% from $8.3M in the preceding 12 months. 15 prime contractors received positive obligations, and 2 of them accounted for 80% of that spend.
Prime contracts funded by the Department of Defense. Latest 12 months: Oct 6, 2025 to Oct 5, 2026. Source: USAspending.gov.
DoD publishes contract data to USAspending with a 90-day delay, so the most recent months understate DoD activity.
Obligations by fiscal year
Net prime contract obligations by federal fiscal year (October to September).
Top DoD contractors for NAICS 336510
Ranked by positive obligations in the latest 12 months. Share is of all positive obligations in this market.
| # | Contractor | Latest 12 mo | Prior 12 mo | Share | Rank change |
|---|---|---|---|---|---|
| 1 | S & S Forest Products, LLC | $17.9M | $0 | 75.5% | New |
| 2 | Eastern R&E Co. Ltd | $3.1M | $3.2M | 12.9% | ▼ 1 |
| 3 | Knds Defence UK Limited | $1.3M | $0 | 5.5% | New |
| 4 | Harmer Steel Products Company | $657K | $73K | 2.8% | ▲ 7 |
| 5 | Atap Inc | $224K | $0 | 0.9% | New |
| 6 | Military Airlift Experts LLC (Milairx LLC) | $171K | $233K | 0.7% | — |
| 7 | JA Moody LLC | $153K | $0 | 0.6% | New |
| 8 | LKR, Inc. | $118K | $0 | 0.5% | New |
| 9 | MO Enterprises | $37K | $0 | 0.2% | New |
| 10 | Vastglobe Logistics LLC | $32K | $0 | 0.1% | New |
| 11 | Railmark Track Works Inc | $31K | $0 | 0.1% | New |
| 12 | Echelon Supply and Service, Inc. | $23K | $30K | 0.1% | ▲ 4 |
| 13 | Mazzella Lifting Technologies, Inc. | $2K | $0 | 0.0% | New |
| 14 | Optiplex LLC | $600 | $0 | 0.0% | New |
| 15 | Kampi Components Co Inc | $283 | $0 | 0.0% | New |
What changed in the last 12 months
Contractors with the largest change in reported obligations versus the preceding 12 months.
Largest gains
- S & S Forest Products, LLC$0 → $17.9M (+$17.9M) · now #1
- Knds Defence UK Limited$0 → $1.3M (+$1.3M) · now #3
- Harmer Steel Products Company$73K → $657K (+$584K) · now #4
Largest declines
- American Equipment Company$2.2M → $0 (−$2.2M) · no latest-period obligations
- RCE Equipment Solutions Inc$770K → $0 (−$770K) · no latest-period obligations
- Hydrema U.S., Inc.$561K → $0 (−$561K) · no latest-period obligations
New to this market
9 contractors received their first obligations in this market (since FY2022) during the latest 12 months. The largest:
| Contractor | First obligation | Latest 12 mo |
|---|---|---|
| S & S Forest Products, LLC | Apr 28, 2026 | $17.9M |
| Knds Defence UK Limited | Oct 21, 2025 | $1.3M |
| JA Moody LLC | Apr 2, 2026 | $153K |
| LKR, Inc. | Jun 17, 2026 | $118K |
| MO Enterprises | May 1, 2026 | $37K |
| Railmark Track Works Inc | Apr 23, 2026 | $31K |
| Mazzella Lifting Technologies, Inc. | Jun 12, 2026 | $2K |
| Optiplex LLC | Apr 27, 2026 | $600 |
Where the money comes from
Funding sub-agencies within the Department of Defense, latest 12 months. The funding organization can differ from the office that runs the requirement.
| Funding sub-agency | Latest 12 mo | Prior 12 mo | Change |
|---|---|---|---|
| Department of the Army | $23.2M | $7.8M | Up $15.4M (196.2%) |
| Defense Logistics Agency | $520K | $427K | Up $92K (21.6%) |
| Department of the Navy | $2K | $17K | Down $15K (87.3%) |
Potential recompetes
Large awards in this market whose current period of performance ends in the next 18 months. Treat these as research leads: options, extensions, and follow-on vehicles often change the timing.
| Award | Incumbent | Obligated | Current end |
|---|---|---|---|
| W912CH26C0004 | Knds Defence UK Limited TRANSPORT KIT, RAIL NSN: 2240-99-847-6882 16EA. | $1.3M | Oct 21, 2026 |
| W90VN926FA015 | Eastern R&E Co. Ltd EXTEND THE CONTRACT FOR THE PERIOD OF 01 JANUARY 2026 THROUGH 31 DECEMBER 2026 BY EXERCISING THE 2ND OPTION PERIOD PURSUANT TO CONTRACT CLAUSE TERMS AND INCORPORATE TWO MINOR… | $3.1M | Dec 31, 2026 |
| W519TC26CA020 | S & S Forest Products, LLC RAILROAD MATERIALS | $17.9M | Feb 27, 2027 |
Common questions
Who are the top DoD contractors for NAICS 336510?
In the latest 12 months, S & S Forest Products, LLC ($17.9M), Eastern R&E Co. Ltd ($3.1M), Knds Defence UK Limited ($1.3M) received the most DoD obligations for railroad rolling stock manufacturing.
How concentrated is this market?
The eight largest primes held 99.5% of positive obligations, and S & S Forest Products, LLC alone held 75.5%. 9 contractors won their first obligations in this market during the latest 12 months.
Are any large DoD NAICS 336510 contracts ending soon?
3 of the largest awards in this market reach their current end date in the next 18 months. The first is W912CH26C0004 (Knds Defence UK Limited, $1.3M obligated), ending Oct 21, 2026. An end date is a research lead, not a confirmed recompete: options and extensions often move it.
Related markets
Figures are net obligations on prime contracts (award types A–D) from USAspending.gov, grouped by funding agency and the NAICS code on each award. Net obligations include deobligations and corrections, so they can differ from positive-obligation totals. See methodology.
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