Maybe this will help. The periodic inspection requirements build on each other. For example, a 92 service day inspection will include everything that is listed in addition to all the requirements of a 31 service day inspection. An annual will include what is listed in addition to all the requirements of a 31 and 92 service day inspection, and so on. Most of the steam locomotives in the US see 15 years before they will see 1492 service days. The D&S is an exception and most of their locomotives are starting to hit 1472 service days after about 11-13 years. At a minimum, if a steam locomotive is used during the year, it will recieve an annual inspction, regardless of the amount of service days.
_____________________________________________________________________
Appendix A to 49 CFR Part 230—Inspection RequirementsThe lists in this appendix are intended as guidance only. Adherence to this list does not relieve the steam locomotive owner and/or operator of responsibility for either: (1) Completing the inspection and maintenance requirements described in this part; or (2) ensuring that the steam locomotive, tender and its parts and appurtenances are safe and suitable for service.
Daily Inspection Requirements; § 230.13
1. Observance of lifting pressure of the lowest safety valve.
2. Testing of water glasses and gauge cocks.*
3. Inspection of tubular water glass shields.
4. Inspection of all cab lamps.*
5. Inspection of boiler feedwater delivery systems.*
6. Inspection of lagging for indication of leaks.
7. Inspection for leaks obstructing vision of engine crew.
8. Observance of compressor(s) and governor to ascertain proper operation.*
9. Inspection of brake and signal equipment.*
10. Inspection of brake cylinders for piston travel.
11. Inspection of foundation brake gear.
12. Inspection of sanders.*
13. Inspection of draw gear and chafing irons.
14. Inspection of draft gear.
15. Inspection of crossheads and guides.
16. Inspection of piston rods and fasteners.
17. Inspection of main, side, and valve motion rods.
18. Inspection of headlights and classification lamps.*
19. Inspection of running gear.
20. Inspection of tender frames and tanks.
21. Inspection of tender trucks for amount of side bearing clearance.
Note: All items marked (*) should be checked at the beginning of each day the locomotive is used.
31 Service Day Inspection Requirements; § 230.14
1. Washing of boiler.
2. Cleaning and inspection of water glass valves and gauge cocks.
3. Cleaning, washing and inspection of arch tubes, water bar tubes, circulators and siphons.
4. Removal and inspection of all washout and water tube plugs.
5. Testing of all staybolts.
6. Removal, cleaning and inspection of fusible plugs (if any).
92 Service Day Inspection Requirements; § 230.15
1. Removal and testing of all air and steam gauges.
2. Cleaning of steam gauge siphon pipe.
3. Renewal of tubular water glasses.
4. Testing and adjusting of safety relief valves.
5. Testing of main reservoir and brake cylinder leakage.
6. Entering and inspection of tender tank interior.
Annual Inspection Requirements; § 230.16
1. Testing of thickness of arch and water bar tubes (arch brick to be removed)
2. Hydrostatic testing of boiler.
3. Testing of all staybolts.
4. Interior inspection of boiler.
5. Thickness verification of dry pipes.
6. Smoke box inspection.
7. Main reservoir hammer or UT testing and hydrostatic testing (for non-welded and drilled main reservoirs)
8. Removal and inspection of steam locomotive drawbar(s) and pins (NDE testing other than merely visual)
9. Inspection of longitudinal lap joint boiler seams.
5 Year Inspection Requirements; § 230.16
1. Inspection of flexible staybolt caps and sleeves.
1472 Service Day Inspection Requirements; § 230.17
1. Removal of boiler flues (as necessary) and cleaning of boiler interior.
2. Removal of jacket and lagging and inspection of boiler interior and exterior.
3. Hydrostatic testing of boiler.
4. Thickness verification (boiler survey) and recomputation and update of steam locomotive specification card, (FRA Form No. 4).