modifies Section 333 of the USC Title 10.

As of 2004

The President, by using the militia or the armed forces, or both,
or by any other means, shall take such measures as he considers
necessary to suppress, in a State, any insurrection, domestic
violence, unlawful combination, or conspiracy, if it -
(1) so hinders the execution of the laws of that State, and of
the United States within the State, that any part or class of its
people is deprived of a right, privilege, immunity, or protection
named in the Constitution and secured by law, and the constituted
authorities of that State are unable, fail, or refuse to protect
that right, privilege, or immunity, or to give that protection;
or
(2) opposes or obstructs the execution of the laws of the
United States or impedes the course of justice under those laws.

In any situation covered by clause (1), the State shall be
considered to have denied the equal protection of the laws secured
by the Constitution.

As of 2007

`(a) USE OF ARMED FORCES IN MAJOR PUBLIC EMERGENCIES- (1) The President may employ the armed forces, including the National Guard in Federal service, to--

`(A) restore public order and enforce the laws of the United States when, as a result of a natural disaster, epidemic, or other serious public health emergency, terrorist attack or incident, or other condition in any State or possession of the United States, the President determines that--

`(i) domestic violence has occurred to such an extent that the constituted authorities of the State or possession are incapable of maintaining public order; and

`(ii) such violence results in a condition described in paragraph (2); or

`(B) suppress, in a State, any insurrection, domestic violence, unlawful combination, or conspiracy if such insurrection, violation, combination, or conspiracy results in a condition described in paragraph (2).

`(2) A condition described in this paragraph is a condition that--

`(A) so hinders the execution of the laws of a State or possession, as applicable, and of the United States within that State or possession, that any part or class of its people is deprived of a right, privilege, immunity, or protection named in the Constitution and secured by law, and the constituted authorities of that State or possession are unable, fail, or refuse to protect that right, privilege, or immunity, or to give that protection; or

`(B) opposes or obstructs the execution of the laws of the United States or impedes the course of justice under those laws.

`(3) In any situation covered by paragraph (1)(B), the State shall be considered to have denied the equal protection of the laws secured by the Constitution.

I'm not a lawyer, but I can't really see much difference here, other than getting more specific. Am I missing something here?

As for building more railcars with shackles??? Does that conjure up an image in anyone's mind? Apparently so: A quick google search revealed nothing but hysterical sites ranting about concentration camps. Gunderson Steel has apparently recieved orders for either 400 boxcars, or 107,200. Some not only have shackles but guillotines! Not passing smell tests here.
Got anything more concrete?