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Discussion History

Underframe

Assembly

Welded steel chassis carrying the carbody and transferring loads to the bogies through center pivots. A full specification article for this item is being written. Meanwhile its bill of materials and connections are below.

Underframe parts and their functions

7 top-level parts · 18 parts in total · full bill of materials below
Underframe parts diagram: 1 center sill, 2 side sill, 3 headstock, 4 cross bearer, 5 body bolster, 6 platform cantilever, 7 fastener set. 18 parts in 7 top-level items.
Underframe parts diagram. Numbers match the table below; each box is one top-level part or assembly with what it contains.
#PartQtyWhat it does
1 Center Sill 1× Longitudinal box beam
2 Side Sill 2× Edge longitudinal members
3 Headstock 2× End cross beams
4 Cross Bearer 6× Transverse floor support
5 Body Bolster 2× Bogie pivot interface
6 Platform Cantilever 1× Rear platform support frame
7 Fastener Set 4× Structural bolting

3D model

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Build & assembly graph

expand / collapse · shared sub-assemblies converge · links to related products · est. labour
product / assembly shared across products atomic part related product

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Bill of materials for Underframe

7 top-level lines · 7 rows shown · 18 parts total · indented to 3 levels
# Item / sub-assembly Part no. Qty/assy Ext. qty Parts Type
1 Center Sill observation-car-center-sill 1× 1 · part
2 Side Sill observation-car-side-sill 2× 2 · part
3 Headstock observation-car-headstock 2× 2 · part
4 Cross Bearer observation-car-cross-bearer 6× 6 · part
5 Body Bolster observation-car-bolster-mount 2× 2 · part
6 Platform Cantilever observation-car-platform-cantilever 1× 1 · part
7 Fastener Set fastener-set 4× 4 · part

Where the underframe is used

1 product across 1 domain contain it, directly or inside a sub-assembly

Used in 1 assembly

Observation Car

Sourcing: possible vendors

Browse the supplier directory → Prices, MOQ, and lead times are algorithmic estimates, not quotes, and not claims about these companies. Company mappings are curated by keyword; est. price band $0.50–$200. How estimates work
VendorHQSpecialtyMOQLead time
🇮🇳Bharat Forge
bharatforge.com ↗ 		Pune, IN Forgings & metal parts 500 pcs 6–10 wks
🇨🇳CITIC Dicastal
dicastal.com ↗ 		Qinhuangdao, CN Aluminium castings & wheels 500 pcs 6–10 wks
🇮🇳Tata AutoComp
tataautocomp.com ↗ 		Pune, IN Auto components 500 pcs 6–10 wks
🇸🇬Beyonics
beyonics.com ↗ 		Singapore Precision metal & mfg 500 pcs 6–10 wks
🇮🇳Sundaram Clayton
sundaram-clayton.com ↗ 		Chennai, IN Die castings 500 pcs 6–10 wks