TR1 form is to be filed for all equipment specified in §28-116.4.1 of the Building Code of the City. File this form with the TR1 upon identification of the person or firm who will perform the special inspections. TR1 form is filed with the NYC Building department(DOB) at the initial stage of construction and at the completion of required inspections or tests.
Another version of the TR1 form is NYC d.o.b form called DPL-1 form which is used with applications filed by Design Professional at DOB NOW. Only Structural, Sprinkler, Mechanical System, Plumbing system, Standpipe requires filing at DOB NOW and special inspection agency uses DPL-1 form. It is anticipated in near future all the inspection types including Architectural work types will be filed with the NYC DOB NOW system.
Following are the special inspection types which are identified on the TR-1 form.

Special inspection cost-Compare the price
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Energy Analysis- EN2 Form
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Electrical Motors
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Maintenance Information
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Permanent Certificate
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Solar ready requirements
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Mastic and Intumescent Fire-resistant coating
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Smoke Control Systems
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TR1 BC 1704.3.1
Structural Steel Welding
https://www.youtube.com/watch?v=Peztz21mo1MWelding
TR1 BC1704.3.2 Details
The special inspector shall perform an inspection of the steel frame to verify compliance with the details shown on the approved construction documents, such as bracing, stiffening, member locations and proper application of joint details at each connection, including connections designed for seismic effects1