Setyr worked example — Possession — Down Main MP12.4 to MP15.8 Not approved for use. Version 1 · 2026-09-04
Worked example only — your site must author, review and approve its own
procedure under 29 CFR 1910.147(c)(4). setyr.com/procedures
Possession — Down Main MP12.4 to MP15.8
Rail
Absolute possession of the Down Main for engineering work. PICOP-controlled. Includes 25kV OLE isolation and earthing.
This is a worked example, not a procedure you can adopt. It describes equipment that does not exist, with illustrative tag numbers.
29 CFR 1910.147(c)(4) requires the employer to develop, document and
utilise energy control procedures specific to their own machines, and (c)(6)
requires the employer to inspect those procedures periodically. Neither duty
can be delegated to a vendor or discharged by this document.
Other standards apply to this work.
- 49 CFR 214 subpart C — roadway worker protection. Possession is a rail-specific control that sits alongside, not instead of, energy isolation.
Isolation points
| # | Tag (illustrative) | Type | Disposition | What it does and why | Dwell |
|---|---|---|---|---|---|
| 10 | SIG-SN142-DANGER | Switch | Isolate & lock | Signal SN142 kept at danger with signal post replacement switch. Protects the up end of the possession. | — |
| 20 | SIG-SN156-DANGER | Switch | Isolate & lock | Signal SN156 kept at danger. Protects the down end of the possession. | — |
| 30 | PTS-214B-CLIP | Block | Apply & verify | Points 214B clipped and locked in the normal position. Blocks the intermediate access route. | — |
| 40 | DET-UP-MP124 | Block | Apply & verify | Detonator protection, three detonators on the up line at MP12.4. Placed by the Protection Officer. | — |
| 50 | DET-DN-MP158 | Block | Apply & verify | Detonator protection, three detonators on the down line at MP15.8. | — |
| 60 | PLM-UP-MP124 | Block | Apply & verify | Possession limit marker at MP12.4 with Possession Protection Officer contact details. | — |
| 70 | PLM-DN-MP158 | Block | Apply & verify | Possession limit marker at MP15.8. | — |
| 80 | OLE-DM4-ISO | Disconnect | Isolate & lock | 25kV OLE section DM-4 isolation at the feeder station. Switched out and locked by the Authorised Person. | — |
| 90 | OLE-DM4-EARTH | Chain | Apply & verify | OLE portable earths applied at both ends of section DM-4. Applied after proving dead, removed last. | — |
| 100 | SIGNALLING-SUSP | Switch | Not an isolation device | Normal signalling within the possession. SUSPENDED - signals no longer protect; all movements are under PICOP control. | — |
What your site must supply
- Your own asset and isolation-point tag numbers. The tags shown are illustrative and refer to equipment that does not exist.
- The actual location of every disconnect, valve and vent on your equipment.
- Measured stored-energy magnitudes and the dwell time required to dissipate them.
- Your verification method for each point, and who is authorised to perform it.
- Any additional energy sources present on your equipment and absent here.
Authorship and validation
This example was authored by Setyr for domain validation. It is not derived from any customer's controlled documents. It illustrates the elements 29 CFR 1910.147(c)(4)(ii) requires a procedure to contain — it does not certify compliance, which is a property of an employer's programme rather than of any document.