Union Construction Co., LTD.
Hachioji, Tokyo Part of East Japan Railway Company
- UEI
- HFWHH1GD7W75
- CAGE
- JSN46
- Primary NAICS
- 488210 Support Activities for Rail Transportation
- SAM.gov registration
- Active through
Company facts
- Self-certified in SAM.gov
- Entity structure
- Corporate Entity (Not Tax Exempt)
- NAICS codes registered in SAM.gov
- Corporate family
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East Japan Railway Company
Parent
L6KBGHE7V2U8
- Union Construction Co., LTD. HFWHH1GD7W75
-
East Japan Railway Company
Parent
L6KBGHE7V2U8
- SAM.gov registration date
- Physical address
- 1-8 Asahichō, Hachioji, Tokyo 192-0083, Japan
Registration and certifications come from SAM.gov and the SBA; company details from public web sources. Updated .
Recent federal awards
| Award | Agency | Obligated | Awarded |
|---|---|---|---|
| Maintenance and repairs to the sidetrack roadbed portion of u.s. Government sidetrack no. 328, yokota air base the… | Pacific Air Forces | $220,730 | |
| Maintenance and repairs to the sidetrack roadbed portion of u.s. Government sidetrack no. 328, yokota air base, in a… | Pacific Air Forces | $86,462 | |
| FY24 sidetrack roadbed maintenance at u.s. Government sidetrack no. 328, yokota air base | Pacific Air Forces | $51,514 | |
| FY23 sidetrack roadbed maintenance at u.s. Government sidetrack no. 328, yokota air base | Pacific Air Forces | $107,476 | |
| FY22 sidetrack roadbed maintenance at u.s. Government sidetrack no. 328, yokota air base | Pacific Air Forces | $226,899 |
About Union Construction Co., LTD.
Union Construction Co., LTD., a Tokyo-based child entity of East Japan Railway Company, provides railroad sidetrack maintenance and repairs to the U.S. Air Force as a prime contractor on full-and-open purchase orders with no set-aside designations. The company operates exclusively as a prime (100% of recent awards) and serves only two federal customer agencies, with all work performed at Yokota Air Base in Japan.
Union Construction Co., LTD. has held a consistent, recurring contract relationship with Pacific Air Forces spanning at least five fiscal years. The vendor has received annual firm fixed-price purchase orders for maintenance and repairs to U.S. Government Sidetrack No. 328 at Yokota Air Base, with contract values ranging from approximately $51,500 to $226,900 per year. Recent awards include a $220,730 purchase order covering the period November 19, 2025, through October 31, 2026; an $86,462 purchase order running October 1, 2024, through September 30, 2025; a $51,514 purchase order for FY24 maintenance awarded October 1, 2023; and a $107,476 purchase order for FY23 maintenance awarded October 1, 2022. The vendor also holds a single $140,000 award from the Defense Logistics Agency Energy for related sidetrack services. Across all awards in the source data, the company delivers labor, materials, transportation, equipment, supervision, and project management to maintain railroad infrastructure to operational standards, with emphasis on inspection, routine maintenance, and electric systems work.
Customer concentration is extreme: Pacific Air Forces accounts for 86% of combined potential value across six awards ($866 thousand), with Defense Logistics Agency Energy accounting for the remaining 14% ($140 thousand). Activity has remained flat at one award per year across the past five years, with total combined potential value at $1 million and $1 million obligated. One award valued at $221 thousand faces ultimate completion within the next twenty-four months and enters recompete. The vendor's footprint is narrowly specialized in rail transportation maintenance (NAICS Support Activities for Rail Transportation, PSC Maint/Repair/Rebuild Of Equipment- Railway Equipment) with no subcontract activity.
Quick answers
What is Union Construction Co., LTD.'s UEI?
Union Construction Co., LTD.'s Unique Entity ID (UEI) in SAM.gov is HFWHH1GD7W75.
What is Union Construction Co., LTD.'s CAGE code?
Union Construction Co., LTD.'s CAGE code is JSN46.
What is Union Construction Co., LTD.'s primary NAICS code?
Union Construction Co., LTD.'s primary NAICS code is 488210 (Support Activities for Rail Transportation).
Where is Union Construction Co., LTD. located?
Union Construction Co., LTD.'s physical address in SAM.gov is 1-8 Asahichō, Hachioji, Tokyo 192-0083, Japan.
Is Union Construction Co., LTD. registered in SAM.gov?
Yes. Union Construction Co., LTD.'s SAM.gov registration is active through June 23, 2027.
Who is Union Construction Co., LTD.'s parent company?
Union Construction Co., LTD. is part of East Japan Railway Company.
What is Union Construction Co., LTD.'s most recent federal award?
Union Construction Co., LTD.'s most recent federal contract award is Maintenance and repairs to the sidetrack roadbed portion of u.s. Government sidetrack no. 328, yokota air base the… (FA520926P0004), from Pacific Air Forces, on November 19, 2025.
On GovTribe
See Union Construction Co., LTD.'s full federal record
- Federal contract awards
- Funding analysis by agency, NAICS and set-aside
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