EXHIBIT 5.1



                  [Simpson Thacher & Bartlett LLP Letterhead]



                                          January 23, 2006


Dresser-Rand Group Inc.
Paul Clark Drive
Olean, New York 14760

Ladies and Gentlemen:

      We have acted as counsel to Dresser-Rand Group Inc., a Delaware
corporation (the "Company"), and to Dresser-Rand LLC, a Delaware limited
liability company, Dresser-Rand Power LLC, a Delaware limited liability company,
Dresser-Rand Company, a New York Corporation, Dresser-Rand Global Services,
L.L.C., a Delaware limited liability company, and D-R Steam LLC, a Delaware
limited liability company, (individually, a "Guarantor" and collectively, the
"Guarantors") in connection with the Registration Statement on Form S-4 (the
"Registration Statement") filed by the Company and the Guarantors with the
Securities and Exchange Commission (the "Commission") under the Securities Act
of 1933, as amended, relating to the issuance by the Company of $370,000,000
aggregate principal amount of its 7-3/8% Senior Subordinate Notes due 2014 (the
"Exchange Securities") and the issuance by the Guarantors of guarantees (the
"Guarantees") with respect to the Exchange Securities. The Exchange Securities
and the Guarantees will be issued under an indenture dated as of October 29,
2004 among the Company, the Guarantors and Citibank, N.A., as trustee (the
"Trustee"), as supplemented by a supplemental indenture, dated as of December
22, 2005 (the "Indenture"). The Exchange Securities will be offered by the
Company in exchange for $370,000,000 aggregate principal amount of its
outstanding 7-3/8% Senior Subordinated Notes due 2014.

      We have examined the Registration Statement and the Indenture, which has
been filed with the Commission as an exhibit to the Registration Statement. We
also have examined the originals, or duplicates or certified or conformed
copies, of such corporate records, agreements,



documents and other instruments and have made such other investigations as we
have deemed relevant and necessary in connection with the opinions hereinafter
set forth. As to questions of fact material to this opinion, we have relied upon
certificates or comparable documents of public officials and of officers and
representatives of the Company and the Guarantors.

      In rendering the opinions set forth below, we have assumed the genuineness
of all signatures, the legal capacity of natural persons, the authenticity of
all documents submitted to us as originals, the conformity to original documents
of all documents submitted to us as duplicates or certified or conformed copies
and the authenticity of the originals of such latter documents. We also have
assumed that the Indenture is the valid and legally binding obligation of the
Trustee.

      Based upon the foregoing, and subject to the qualifications, assumptions
and limitations stated herein, we are of the opinion that:

            1. When the Exchange Securities have been duly executed,
      authenticated, issued and delivered in accordance with the provisions of
      the Indenture upon the exchange, the Exchange Securities will constitute
      valid and legally binding obligations of the Company, enforceable against
      the Company in accordance with their terms.

            2. When (a) the Exchange Securities have been duly executed,
      authenticated, issued and delivered in accordance with the provisions of
      the Indenture upon the exchange and (b) the Guarantees have been duly
      issued, the Guarantees will constitute valid and legally binding
      obligations of the Guarantors, enforceable against the Guarantors in
      accordance with their terms.

      Our opinions set forth above are subject to (i) the effects of bankruptcy,
insolvency, fraudulent conveyance, reorganization, moratorium and other similar
laws relating to or affecting creditors' rights generally, (ii) general
equitable principles (whether considered in a proceeding in equity or at law)
and (iii) an implied covenant of good faith and fair dealing.

      We do not express any opinion herein concerning any law other than the law
of the State of New York, the Delaware Limited Liability Company Act and the
Delaware General Corporation Law (including the statutory provisions, all
applicable provisions of the Delaware Constitution and reported judicial
decisions interpreting the foregoing).



      We hereby consent to the filing of this opinion letter as Exhibit 5 to the
Registration Statement and to the use of our name under the caption "Legal
Matters" in the Prospectus included in the Registration Statement.


                                    Very truly yours,

                                    /s/ Simpson Thacher & Bartlett LLP
                                    -----------------------------------

                                    SIMPSON THACHER & BARTLETT LLP